156 



ME. WILLIAM FArRBAIRN ON THE 



TABLE OF MOTIVE FORCES, 



Appucabu: "vo Kailwat Trains, om GRADiEMrFS at 33 Milbs an Houb. 



From the above results it is obvious that the working of 

 steep gradients is only circumscribed by the power of the 

 engine; and, considering the- enormous expense of qoji- 

 structing easy gradients in a mountainous district, it be- 

 comes a question of deep interest to the community, in 

 having lines formed at a moderate cost, and that only at the 

 expense of a proportional increase of power. It cannot be 

 doubted that the locomotive engine of the present day is 

 more than commensurate for the attainment of these ob- 

 jects ; and, provided we carefully adjust the weight and 

 powers of the engines to the work they have to perform, 

 we may safely calculate on a great saving of expense to the 

 community, increased dividends to the shareholders, and an 

 equally efficient tractive power to overcome the resistances 



